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Ban, slowdown or stop massive login attempts to RDP

I have a Windows 2008 Server which is being attacked very hard.

Somebody is trying to use brute force to sign in to the server via remote desktop protocol. And looks like that attacker has a big range of IPs or bot net for attacks. Because, I have banned a thousands of his IPs and he is still able to continue attacking the server.

Please advise any way to reject any RDP sign in attempt if it fails 2nd time within one year from the same IP.

I think I need to create a rule to deny all attempts over the RDP protocol besides my IPs. The same rules for all other public resources, correct?

Highly appreciate any help.

Best regards.

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migrated from stackoverflow.com Sep 24 '11 at 23:27

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marked as duplicate by GregD, Wesley, Ward, mailq, Zoredache Sep 25 '11 at 10:16

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This question will be better answered in ServerFault.com. –  Paulo Santos Sep 24 '11 at 23:25
    
did you piss somebody off? –  tony roth Sep 24 '11 at 23:45
    
Which version of Windows Server? –  Mark Henderson Sep 24 '11 at 23:52
    
For reference, this attack is widespread, it is likely that all visible RDP servers are being attacked. –  Harry Johnston Sep 25 '11 at 7:39
    
Version: Windows server 2008 R2 Standard. I have only windows firewall :) Is it enough to be defended from the bad boys? Or I should install some other software? I can access the server via RDP, this is why I can't make a rule to deny RDP. –  user963113 Sep 25 '11 at 10:25
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1 Answer

Temporarily disable the RDP allow rule in your firewall. Other than that you'll just wind up spending countless minutes/hours blocking ip addresses.

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Alternative; at a firewall in front of the server, set it to allow only from certain IP's. –  Bart Silverstrim Sep 25 '11 at 0:46
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That's a better solution. Thanks, Bart. –  joeqwerty Sep 25 '11 at 1:09
    
Subset suggestion of your answer, @Joeqwerty. Endorse voting your answer up for it. –  Bart Silverstrim Sep 25 '11 at 1:48
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This is why we run RDP and SSH for our servers over a VPN. It eliminates bruteforcing from all creation and strictly limits access to company employees so we don't have to waste time trying to prevent this kind of thing. –  Fiasco Labs Sep 25 '11 at 3:03
    
Or you change the listening port for RDP to something completely different. –  mailq Sep 25 '11 at 9:52
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